What is CVE-2026-103418?

CVE-2026-103418 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-13.

How severe is CVE-2026-103418?

High severity. CVSS v3 base score is 8.8 out of 10.

CVE-2026-103418

CVE-2026-103418

Firefox for iOS directly interpolated the page’s HTML language attribute into translation JavaScript, allowing attacker-controlled markup to execute code in Firefox’s privileged content world and bypass the page’s Content Security Policy. This vulnerability was fixed in Firefox for iOS 157.1.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-13 · last modified 2026-10-13.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

Frequently asked questions

What is CVE-2026-103418?: CVE-2026-103418 is a high-severity vulnerability, classified under Cross-site Scripting. CVSS score: 8.8/10. Published 2026-10-13.
How severe is CVE-2026-103418?: High severity. CVSS v3 base score is 8.8 out of 10.